Reasons for using the FusionInsight system

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As data increases, structured data (such as financial data), semi-structured or unstructured data (such as orders, contracts, and logs), and related data obtained from the Internet are accumulated in enterprises' production and operation systems. The data contains huge value. The existing first data plane of enterprises (represented by Oracle and EMC products) is expensive and difficult to expand. It applies only to the processing of structured data. In the big data era, enterprises need to construct the second data plane to process higher amounts of multi-dimensional data. Data of the second data plane comes from the first data plane and external systems. The construction or operation of the second data plane does not affect the first transaction-oriented data plane.

Other related questions:
What is FusionInsight system used for?
As data increases, structured data (such as financial data), semi-structured or unstructured data (such as orders, contracts, and logs), and related data obtained from the Internet are accumulated in enterprises' production and operation systems. The data contains huge value. The existing first data plane of enterprises (represented by Oracle and EMC products) is expensive and difficult to expand. It applies only to the processing of structured data. In the big data era, enterprises need to construct the second data plane to process higher amounts of multi-dimensional data. Data of the second data plane comes from the first data plane and external systems. The construction or operation of the second data plane does not affect the first transaction-oriented data plane.

Why do I use the FusionInsight system?
As data increases, structured data (such as financial data), semi-structured or unstructured data (such as orders, contracts, and logs), and related data obtained from the Internet are accumulated in enterprises' production and operation systems. The data contains huge value. The existing first data plane of enterprises (represented by Oracle and EMC products) is expensive and difficult to expand. It applies only to the processing of structured data. In the big data era, enterprises need to construct the second data plane to process higher amounts of multi-dimensional data. Data of the second data plane comes from the first data plane and external systems. The construction or operation of the second data plane does not affect the first transaction-oriented data plane.

Method used to unlock a user in the FusionInsight HD system
To unlock a system user, log in to FusionInsight Manager and click System. In the Rights Configuration area, click User Management. In the row where the user to be unlocked is located, click the unlock button. To unlock an internal user, log in to any management node as user omm and run the sh ${BIGDATA_HOME}/om-server/om/share/om/acs/config/unlockuser.sh --userName name of the system internal user command, for example, sh ${BIGDATA_HOME}/om-server/om/share/om/acs/config/unlockuser.sh --userName oms/manager.

Reason why a coherent system uses fewer OA boards than a non-coherent system
OA boards are used to compensate for insertion loss. Only one OA board is required in case that Gmax (maximum gain) �?Fiber loss + DCM loss; otherwise, two OA boards are required. The coherent system does not require DCMs, and a single OA board can compensate for larger link loss. When the link loss is within the permitted range, the coherent and non-coherent systems require the same number of OA boards. When the fiber loss is out of the permitted range, the coherent system, however, requires fewer OA boards. For example, in a system with a 60 km span, 18 dB fiber loss, and 5 dB DCM loss: The gain required by a coherent system is calculated as follows: Gain = Fiber loss + DCM loss = 18 dB + 0 dB (no DCM) = 18 dB < Gmax. Therefore, one OA board (OAU101) is required. The gain required by a non-coherent system is calculated as follows: Gain = Fiber loss + DCM loss = 18 dB + 5 dB = 23 dB < Gmax. Therefore, one OA board (OAU101) is required. In a system with a 100 km span, 28 dB fiber loss, and 9 dB DCM loss: The gain required by a coherent system is calculated as follows: Gain = Fiber loss + DCM loss = 28 dB + 0 dB (no DCM) = 28 dB < Gmax. Therefore, one OA board (OAU101) is required. The gain required by a non-coherent system is calculated as follows: Gain = Fiber loss + DCM loss = 28 dB + 9 dB = 37 dB > Gmax (36 dB for an EDFA board). Therefore, two OA boards (OAU101 and OBU101) are required.

Definition of service in the FusionInsight system
A service is a kind of service capability provided by a component in a cluster. Each component in the cluster provides a service and is named by the service. For example, HBase, HDFS, and Spark are all service names.

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